Highway 303 was added to the state highway system as part of a large transfer of county roads to the state system that took place on April 24, 1963.[1] Initially only the portion from Mayfield to the Benton County line was transferred to state maintenance.

^ abcdPlanning and Research Division (2010). "Arkansas Road Log Database" (Database). Arkansas State Highway and Transportation Department. Archived from the original on 23 June 2011. Retrieved June 9, 2011.